System information

phishing, 258
PSTN circuits and VoIP connections, 145
scanning for valid accounts, 565
servers, 653
SIP, 622
SPIT, 258
test users, 383
toll fraud, 257
VoIP, 636–638
DMZ, 638
encryption, 637, 638
physical security, 638
segregating voice and data traffic, 637
server hardening, 638
SPIT, 636
spoofing, 637
segregating voice and data traffic, 637
SELinux (Security-Enhanced Linux), 51
SEND IMAGE AGI command, 484
SEND TEXT AGI command, 484
SendFAX() dialplan application, 450
sending email, 568
sendvoicemail option (voicemail.conf), 164
server certificates, 151
serveremail option (voicemail.confl), 158
serverhost option (jabber.conf), 420
servers, 641
(see also CentOS Server; Ubuntu Server)
Asterisk as a standalone voicemail server,
174–178
Asterisk server, 182–185
Festival server, 587
hardening: VoIP, 638
requirements, 641–649
security, 653
server hardening, 638
Service (SIP SRV record), 239
servicelevel option (queues.conf), 276
session handling, AMI, 467
Session Initiation Protocol (see SIP)
SET AUTOHANGUP AGI command, 484
SET CALLERID AGI command, 484
SET CONTEXT AGI command, 484
SET EXTENSION AGI command, 484
SET MUSIC AGI command, 484
SET PRIORITY AGI command, 484
SET VARIABLE AGI command, 484
Set() application, 198
set-based paging, 231
setinterfacevar option (queues.conf), 277
setqueueentryvar option (queues.conf), 277
setqueuevar option (queues.conf), 277
shared extensions, example, 325
Shared Line Appearances (see SLA)
shared_lastcall option (queues.conf), 263, 275
Signaling System 7 (SS7), 614
silencethreshold option (voicemail.conf), 159
Simple Network Management Protocol (see
SNMP)
Simplified Message Desk Interface (SMDI),
voicemail, 177
single-party call, 547
single-party call CDR, 536
single-port firewall penetration, 95
SIP (Session Initiation Protocol)
about, 83, 147, 620–622
Asterisk as a standalone voicemail server,
174–177
authentication, 567
calls: encryption, 150
channels
device state information, 295
transfers on, 222
configuration matching, 93
denial of service attacks, 258
headers, 176
providers: connecting Asterisk systems to,
149
registrations, 257
trunks
configuring, 147
SLA key system example with SIP trunks,
323
URI, 238
sip reload command, 439
sip show peers command, 149
sip show settings CLI command, 240
SIP-based paging, 232
sip.conf, 89–95, 175, 240, 356, 374, 439
SIPAddHeader() voicemail application, 176
sippeers, 439
size option (cdr.conf), 530
Skinny Client Control Protocol (SCCP), 625
skipms option (voicemail.conf), 159
Skype, 429–434
dialplan, 429–434
calling without assigning extension
numbers, 433
Index | 689